Tach Pulse (RPM Reference) Signal

Connect scan tester to DLC. RPM should be indicated on tester when engine is cranked or running. Tach pulse (RPM reference) will be indicated as a voltage signal when a DVOM (with a minimum 10-megohm input impedance) is used to backprobe circuit No. 430 PCM terminal. For circuit and terminal reference, see appropriate schematic in NO START - ENGINE CRANKS OKAY.